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Saturday, 31 October

JEE Main 2024 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 1 February 2024, Shift 2, Chemistry Q82

Question 82 of 90 in this shift, Chemistry question 22 of 30, Section B.

For a certain reaction at 300K, K = 10, then ΔG∘\Delta G^\circ for the same reaction is −- ________ ×10−1\times 10^{-1} kJ mol−1^{-1}. (Given R = 8.314 J K−1^{-1} mol−1^{-1})

Official answer

57

NTA final key.

Chapter
Thermodynamics (Chemistry)
Topic
Gibbs Free Energy
Idea tested
Gibbs Energy and Equil

Same idea in other shifts

Asked 10× in all
  1. 4 Apr 2026, Shift 2 · Q72For the following reaction at 50 ∘^\circC and at 2 atm pressure, 2N2O5(g)⇌2N2O4(g)+O2(g)\mathrm{2N_2O_5(g)\rightleftharpoons2N_2O_4(g)+O_2(g)}…HardNumerical value
  2. 6 Apr 2026, Shift 1 · Q75Consider the reaction X⇌Y\mathrm{X\rightleftharpoons Y} at 300 K. If ΔHθ\Delta H^\theta and K are 28.40 kJ mol−1^{-1} and 1.8×10−71.8\times10^{-7}…MediumNumerical value
  3. 31 Jan 2024, Shift 1 · Q84Consider the following reaction at 298 K. 32O2(g)⇌O3(g)\frac{3}{2}\mathrm{O_{2(g)}} \rightleftharpoons \mathrm{O_{3(g)}}.…EasyNumerical value
  4. 6 Apr 2023, Shift 1 · Q84The value of log K for the reaction A⇌B\mathrm{A \rightleftharpoons B} at 298 K is ________. (Nearest integer) Given:…MediumNumerical value
  5. 24 Jun 2022, Shift 1 · Q822O3(g)⇌3O2(g)\mathrm{2O_3(g)\rightleftharpoons 3O_2(g)} At 300 K, ozone is fifty percent dissociated. The standard free energy change at this…MediumNumerical value
  6. 25 Jun 2022, Shift 1 · Q84The standard entropy change for the reaction 4Fe(s)+3O2(g)→2Fe2O3(s)4\mathrm{Fe(s)} + 3\mathrm{O_2(g)} \rightarrow 2\mathrm{Fe_2O_3(s)} is…EasyNumerical value
  7. 26 Jun 2022, Shift 2 · Q8640% of HI undergoes decompostion to H2\mathrm{H_2} and I2\mathrm{I_2} at 300 K. ΔG⊖\Delta G^\ominus for this decompostion reaction at one…MediumNumerical value
  8. 31 Aug 2021, Shift 2 · Q31The incorrect expression among the following is :MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.